Enterprise Spring Boot Architecture Blueprint

Welcome to Module 2: Data, Persistence & Safety. In this section of the curriculum, learners dive deep into foundational and advanced principles designed for production application. This module covers: Run PostgreSQL 16 in Docker for local dev parity with production, configure datasource properties, and connect Spring Boot to a real relational database.; Replace dangerous spring.jpa.hibernate.ddl-auto with Flyway versioned SQL migrations, ensuring safe, auditable, and reversible schema evolution.; Model JPA entities with correct field types, use BigDecimal (never double/float) for all monetary values, and understand why floating-point math silently corrupts financial systems..

Welcome to Module 3: Security & Identity. In this section of the curriculum, learners dive deep into foundational and advanced principles designed for production application. This module covers: Hash passwords correctly using BCrypt with Spring Security's PasswordEncoder: never store plaintext or use reversible hashing algorithms.; Build a complete stateless JWT authentication system: token generation, signature verification, and a JwtAuthFilter that integrates with Spring Security's filter chain.; Enforce endpoint-level permissions using @PreAuthorize and @Secured annotations with Spring Security's method-level RBAC and custom UserDetailsService..

Welcome to Module 4: Performance, Resilience & Integration. In this section of the curriculum, learners dive deep into foundational and advanced principles designed for production application. This module covers: Configure Redis 7 as a write-evict caching layer with @Cacheable and @CacheEvict to serve high-frequency reads without hitting the database on every request.; Wrap outbound RestClient HTTP calls in Resilience4j circuit breakers, timeouts, and retry policies to prevent a slow downstream service from cascading into your API.; Implement async webhooks using @Async and Spring's task executor so that outbound event notifications never block the calling HTTP thread or degrade response latency..

Welcome to Module 5: Testing, Deployment & Operations. In this section of the curriculum, learners dive deep into foundational and advanced principles designed for production application. This module covers: Structure unit tests with Mockito and integration tests with @SpringBootTest + Testcontainers, keeping them strictly separated in Gradle source sets.; Build a minimal JRE Docker image using a multi-stage Dockerfile, configure docker-compose.yml to orchestrate the API alongside PostgreSQL and Redis with healthcheck gating.; Configure a GitHub Actions CI pipeline that fails builds on test failures, code coverage drops, or SpotBugs static analysis violations before any artifact is produced..